> If you're on a release copy of sourcemod, it will auto-update to the latest
> release gamedata. If you're on a snapshot of 1.3 or 1.4, you'll need to do
> it manually.
>
> For metamod source, you have to do it manually no matter what, as far as I
> know.
>
> Source is a post by Psychonic (the fellow who, among other things, pushed
> the gamedata updates), in the thread about today's update.

Quote:

For the gamedata updates, if you're on a release version of SM, 1.3.3 - 1.3.6, just restart your server.

If you're on a 1.3 snapshot, you must download the newest 1.3 snapshot and replace at least the gamedata directory. Likewise on 1.4 with a 1.4 snapshot.